Selective switch system.



I. B. CASE. SELECTIVE SWITCH SYSTEM.

APPLICATION IILED AUG. 7, 1908.

Patented May 26, 1914.

1n veintbF- aEta'nk nca' witnesseszi,

rm n. CASE, or

snnncrivn swITcH SYSTEM.

Application filed August 7, 1908. Serial flu 447,351.

7 To all whom i t'may concern:

Be' it"known that I, FRANK E. CASE,-a.

citizen; of the United States, residing at "Schenectady, county of Schenectady, State ofNew York, have invented certain new and useful Improvements in Selective Switch Systems, of'which the following is a speci fication.

My invention relates to selective systems of switches and is particularly useful in connection with electrically driven cars designed for operation on roads operated .at

-. difierent places at different potentials, for

example, 1200 and 600 volts. In such-railway systems it is the custom to provide each car with a small motor generator or dynamotor-which, when the car is upon a 1200 volt section of line, serves to reducethe high voltage of the line to a lower voltage,say 600 volts, for the purpose of supplying the control and lighting circuis of the car. When the car is operating upon a 600 volt section of line the control and lighting circuits are disconnected from the dynainotor and are connected directly to the current collecting device. With an equipment of this kind it is desirable that means he provided for automatically connecting the control circuits ofithe car to the trolley either through the dynamotor or directly, according asthe car is on a high or low potential section of line, and it is in service of this kind that 'my invention is particularly useful, although it is not confined to this particular service. In order that there may be no chance of the higher potential being applied to the control circuits the "selective switch device is biased to a position in which it connects the control circuits to the-trolley through the dynamotor; that is, it assumes this position when its actuating circuit is deenergized. In order, therefore, that the switch may be open the connection between the control circuits and the-dynamoto'r and Specification of letters Patent.

UNITED STATES PATE T OFFICE.

sonnnncrany, nnw yonmnssre'non 'ro GENERAL ELECTRIC COMPANY, A conronnrron or NEW-YORK.

rate ntuma 'ee, 1914.-

l It: is an object of my invention to provide a construction and arrangement for accomplishing this purpose.

In the following descriptiontalzen in con- I nection with the accompanying drawing, I

have setfort-h one form in which my invent on may be embodied.

and provided with aselective switch con- 'structed and arranged according to my invent-ion. 4

Referrlng tothe drawing, L is a trolley wire which is at some parts of the line s'upplied with high potential, and at other portions of the line with low potential current; T is a trolley carried by the car; it 1 and Mt.

are the car motors; K and K are the mastersw tches, located at either end of the car, by

which the operator contro s the direction of movement and speed of the car; C represents the contactor box; in which are located the contactors, or electronmgnetically operated switches, which make and break the connections oi the motor circuit under the control of the master-switches K and K to which they are "connected by the train wires contained in the cable I).

A motor generator is shown at A and for thepurposes of this application is shown as of the type covered by a patent in the name of Max B. Hanna, No. 897 ,257 dated August 25, 1908. This dyna-motor has an armature a provided with two armature windings connected, respectively, to comshown at B provides for the control of the dynamotor. The. construction and mode of operation of the dynamotor need not be further explained since it forms no part of my invention. I

The selective switch device by which the control circuits of the car are connected to the'trolle'y, either through the dynamotor or directly, is shown at 0. When in the position shown, this device by its lower switch 0 connects the wire 1, through which the control circuits are fed, through the dynamotor a to the trolley T. This is the position which the switch device 0 assumes when its actuating circuit is deenergized, and also the position in which it is when the car is on a high Voltage section .of line. The upper switch 0' serves when closed to connect the control circuits fed through the wire f directly to the trollev T. In the form of selective switch device" 0 illustrated in this application the movable members of the switches 0 and 0 are mechanically connectcd, being mounted upon a rod 12 extending upward from a core of magnetic material 3 arranged for movement in the field produced by a coil 4. mounted. in a field frame The upper end otthe rod 2 is connected through a spring (5 to a core of magnetic material 7 arranged for movement within the field produced'by a. coil 8 mounted in a field framed. The coils 8 and 4: are connected in series through a resistance 9' between the trolley T and ground, this circuit thus receiving the potential between trolley and ground whetherthe car is on a high or low potential section of line. The upper magnet, of which the coil 8 is a part, is so designed that its core 7 will pull up upon the current r r-hing from the car being on. a low poten at section of line as well as upon the higher current which flows through it when the car is u; on a high potential section. The upper magnet, therefore, serves always to place the spring 6 under a. certain tension and thereby exert a certain upward pull tending to open the switch 0 and close the switch 0 The upward pull exerted by the upper electromagnet is resisted by the lower electromagnet.

the coil 4 of which has such a number of turns when excited by the current resulting from the trolley being on a low potential section of-line that it produces a field insuflicient to hold the cone 3 down and the switch 0 therefore opens and switch 0 closes. When, however, the coil 4 is excited by the greater current resulting from the trolley being on a high potential section, the core 3 will be pulled down and the switches a and 0 will be moved to and maintained. in the position shown against the tension of spring 6. With this arrangement it is clear that the selective switch device 0 will remain in the position shown at all times, except when the car is upon a low; potential sect-ion of line. Smce the switch ticular construction and arrangement herein shown, but aim in the appended claims to cover all modifications which are within the scope of my invention.

' What I claim as new and desire to secure by Letters Patent of the United States, is,

1.- An electricallycontro'lled switch comprising a' resiliently mounted contact member having two positions, electromagnetic mechanism for causing said member to move to said two positions comprising two electromagnets having their windings in series, one of said magnets acting upon the member directly to move it to one position while the other magnet acts through the resilient mounting to move it to the other position.

2. An electrically controlled switch comprising a resiliently mounted contact memher having two positions, electromagnetic mechanism for causing said members to move to said two position.- comprising-two electromagnets having their windings in series, one of said magnets acting directly upon the member to move it to one position while the other acts through the resilient mounting to movethe member to the other position and has a different number of turns from the other Winding.

'3.-An electrically controlled switch comprising two switch members, mechanical connections between said members whereby when one is in open position the other. is in closed position, an ,electromagnet which when energized tends tomove said members to one position, a second electromagnet in circuit with said first' magnet having an members and opposing the action of aid first magnet .upon the members.

. An electrically controlled switch compr sing two resiliently mounted switch members, mechanical connections between said members whereby when one is in open position the other is in closed position,.and-clectromagnetic meansfor causing said members to moveto said two positions comprising. two. electromagnets' having their windings in series, one of'said magnets acting upon-the members directly to move them to one position while the other acts through the resilient mounting to move them to the other position.

armature resiliently connected with said Ill 5. An electrically controlled switch com- I prising two switch members, mechanical connegtmns hetween. saidmemberswhereby 77 on one is n open position the other'isiii than the first t ."closed p0s1t1on,'an electromagnet whih*- In w't l i A y flhavehere to t v.whenenerglzed tends to move said mem 1 nes's w ereo un Se 5 to PM ppsifion, a Second electromagnezieirg rny hand th1s5th day of August, 1908.

ser es w th said first magnet having en armature resilient1y connected with. said members and opposing the actionfof said first magnet upon the members, said second Signed ed sealed this 231.11- day of June, A. 1)., 1914:.

Corteefi o ri in Letters Patent N0 ,O98',0 1; 5

1,098,015 &

magnet havihg a greater number of turns 10 I FRANK E CASE.

Witnesses;

BENJAM fi B, H HELEN- ORIORD.

It is hereby certified that in- Letters Patent No. 1,098,015, granted Maj26,191-1,

. upon the application of Frank E. Case, of Schenectady; New York, for an improve.-

rnent in Selective Switch Systems, an errorappears in the printed specification "requiring" correction as follows:' Page 1, line 43, after the word may strike out the word be; and that thesaid Letters Patent should be, read with this correction 11 mm that ,thesame may conforxh-to the tecordiof the caseixi the Patent Oflice.

. amt R. RWHITEHEAD,

Acting Gommiambner of Patents. v 

